FM radar apparatus
First Claim
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1. An FM radar apparatus for transmitting an FM signal at a target, receiving a reflected signal from the target and detecting the target based on a beat signal obtained by mixing the received signal with a signal relating to the transmitted signal, said FM radar apparatus comprising:
- a detector for detecting at least one of a distance to and a speed of the target from peak frequencies of beat signals in a frequency rise region and a succeeding frequency fall region of said FM signal; and
a separate detector for redetecting at least one of said distance and said speed from said peak frequency in said frequency fall region and a peak frequency of a beat signal in a succeeding frequency rise region of said FM signal.
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Abstract
An FM radar apparatus detects a distance to and/or a speed of a target not only from peak frequencies of beat signals in respective frequency rise and fall regions but also by reusing the peak frequency in the preceding frequency rise or fall region. As a result, it becomes possible to obtain target data at twice the conventional pitch and hence to detect the target more finely and minutely.
26 Citations
14 Claims
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1. An FM radar apparatus for transmitting an FM signal at a target, receiving a reflected signal from the target and detecting the target based on a beat signal obtained by mixing the received signal with a signal relating to the transmitted signal, said FM radar apparatus comprising:
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a detector for detecting at least one of a distance to and a speed of the target from peak frequencies of beat signals in a frequency rise region and a succeeding frequency fall region of said FM signal; and a separate detector for redetecting at least one of said distance and said speed from said peak frequency in said frequency fall region and a peak frequency of a beat signal in a succeeding frequency rise region of said FM signal. - View Dependent Claims (2, 3, 4, 5)
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6. An FM radar apparatus for transmitting an FM signal at a target, receiving a reflected signal from the target and detecting the target based on a beat signal obtained by mixing the received signal with a signal relating to the transmitted signal, said FM radar apparatus comprising:
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a detector for detecting at least one of a distance to and a speed of the target from peak frequencies of beat signals in a frequency fall region and a succeeding frequency rise region of said FM signal; and a separate detector for redetecting at least one of said distance and said speed from said peak frequency of the beat signal in said frequency rise region and a peak frequency of a beat signal in a succeeding frequency fall region of said FM signal. - View Dependent Claims (7, 8, 9, 10)
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11. An FM radar apparatus for sequentially transmitting beams of an FM signal in a plurality of directions lying proximately to each other, receiving a reflected signal from a target located in the directions of beam trans-mission, and detecting the target based on a beat signal obtained by mixing the received signal with a signal relating to the transmitted signal,
wherein said FM radar apparatus allows for switching of the directions of beam transmission upon shifting from said frequency rise region to a succeeding frequency fall region of said FM signal and upon shifting from said frequency fall region to a succeeding frequency rise region of said FM signal, and includes a size detector for detecting the size of said target in the directions of beam transmission, from a spectrum level in said peak frequency of said beat signal in each of said regions.
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12. A method for detecting a target, comprising the steps of:
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transmitting an FM signal at the target; receiving a reflected signal from the target; mixing said received signal with a signal relating to said transmitted signal to provide a beat signal; detecting at least one of a relative distance to and a relative speed of the target from a peak frequency of said beat signal in a frequency rise region and a succeeding frequency fall region of said FM signal; and redetecting at least one of said relative distance to and said relative speed of said target from said peak frequency of said beat signal in said frequency fall region and a peak frequency of a beat signal in a succeeding frequency rise region.
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13. An FM radar apparatus for transmitting an FM signal at a target, receiving a reflected signal from the target and detecting the target based on a beat signal obtained by mixing the received signal with a signal relating to the transmitted signal, said FM radar apparatus comprising:
a detector system for (1) detecting at least one of a distance to and a speed of the target from peak frequencies of beat signals in a frequency rise region and a succeeding frequency fall region of said FM signal, and (2) redetecting at least one of said distance and said speed from said peak frequency in said frequency fall region and a peak frequency of a beat signal in a succeeding frequency rise region of said FM signal. - View Dependent Claims (14)
Specification
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Current AssigneeHonda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
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Original AssigneeHonda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
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InventorsAshihara, Jun
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Primary Examiner(s)Sotomayor, John B.
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Application NumberUS08/974,013Time in Patent Office545 DaysField of Search342/70, 342/71, 342/72, 342/109, 342/111, 342/112, 342/115, 342/116, 342/128, 342/129, 342/192, 342/196US Class Current342/70CPC Class CodesG01S 13/345 using triangular modulationG01S 13/422 sequential lobing, e.g. con...G01S 13/583 using transmission of conti...G01S 2013/93271 in the front of the vehiclesG01S 7/35 Details of non-pulse systemsG01S 7/412 based on a comparison betwe...
